• S R Rajagopalan

      Articles written in Proceedings – Section A

    • Rotating elliptic analysers for the automatic analysis of polarised light—part I

      S R Rajagopalan S Ramaseshan

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      An elliptic analyser, consisting of a birefringent element and a linear element, can be converted into a rotating elliptic analyser by rotating one or both the elements. The Poincaré sphere could be scanned, with such a device, along a meridian, a latitude circle, a great circle of any arbitrary inclination to the equator or any oblique path. Continuous analysis of polarised light can be accomplished by using such an analyser. The principles of some of the possible methods of analysis are presented. The problem of analysis of partially polarised light is also briefly discussed. The speed of analysis is important in analysing changing states of polarisation and depends on the speed of rotation of the elliptic analyser. It is pointed out here that fast rates of scanning are possible by using an electro-optic cell as a birefringent element and rotating the field that causes birefringence.

    • Rotating elliptic analysers and automatic analysis of polarised light—Part II

      S R Rajagopalan S Ramaseshan

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      The various main arrangements leading to a few typical rotating elliptie analysers are discussed. Simple devices for the determination of I, M, C, S of completely and partially polarised light beams are given. The possibility of using a rotating elliptic analyser having an electro-optic cell, for the determination of the Stokes parameters of light beams whose state of polarisation is rapidly changing is pointed out. The accuracy of the Stokes parameter method is analysed and it is found that this method leads to λp andωp values which are subject to an error smaller than one minute of arc (intensity measurement accurate to one in ten thousand). Some of the other methods of using the rotating elliptic analysers are also discussed. It is pointed out that the Stokes parameter method and the interference method, using the concept that orthogonal states do not interfere, are the most promising methods for the analyses of polarised light.

    • On the determination of Ef° from polarographic data

      C S Venkatachalam S R Rajagopalan

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